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Stockholders' Deficit - Schedule of Accumulated Other Comprehensive Loss (Details) - USD ($) | 3 Months Ended
--- | ---
Jun. 30, 2026 | Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ (1,777,000,000) | $ (1,694,000,000)
Other comprehensive income (loss) | (4,000,000) | 34,000,000
Ending balance | (3,864,000,000) | (1,588,000,000)
Gains (losses) related to cash flow hedges | 0 | 0
Derivatives designated for hedge accounting | Net Investment Hedging | Currency swap |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Gains related to net investment hedges | 81,000,000 | (233,000,000)
Derivatives designated for hedge accounting | Cash Flow Hedges | Currency swap |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Gains (losses) related to cash flow hedges | 7,000,000 |
Derivatives designated as cash flow and other hedges | 7,000,000 | 5,000,000
Derivatives designated for hedge accounting | Cash Flow Hedges | Interest rate swap locks, Foreign currency forwards and Other |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Derivatives designated as cash flow and other hedges | 0 | 14,000,000
Total Accumulated Other Comprehensive Loss |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (745,000,000) | (932,000,000)
Other comprehensive income (loss) | (4,000,000) | 34,000,000
Ending balance | (749,000,000) | (898,000,000)
Foreign Currency Translation Adjustments, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (708,000,000) | (989,000,000)
Other comprehensive income (loss) | (69,000,000) | 193,000,000
Ending balance | (777,000,000) | (796,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (58,000,000) | 47,000,000
Other comprehensive income (loss) | 60,000,000 | (172,000,000)
Ending balance | 2,000,000 | (125,000,000)
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Net Investment Hedging |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Other comprehensive income (loss) before reclassification, tax benefit (expense) | (21,000,000) | 61,000,000
Unrealized Gains (Losses) on Net Investment Hedges, Net of Tax | Cash Flow Hedges |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Other comprehensive income (loss) before reclassification, tax benefit (expense) | (2,000,000) | (5,000,000)
Unrealized Gains on Cash Flow and Other Hedges, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 5,000,000 | (4,000,000)
Other comprehensive income (loss) | 5,000,000 | 14,000,000
Ending balance | 10,000,000 | 10,000,000
Unrealized Gains (Losses) and Other Components of Benefit Plans, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 16,000,000 | 14,000,000
Other comprehensive income (loss) | 0 | (1,000,000)
Ending balance | $ 16,000,000 | $ 13,000,000

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